The ratio of lengths of two rods A and B of the same material is 1: 2 and the ratio of their radii is 2: 1. The ratio of modulus of rigidity of A and B will be:

1. 4: 1 2. 16: 1
3. 8: 1 4. 1: 1

Subtopic:  Stress - Strain |
 54%
From NCERT
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When a spiral spring is stretched by suspending a load on it, the strain produced is called:

1. Shearing
2. Longitudinal
3. Volume       
4. shearing and longitudinal


 

Subtopic:  Shear and bulk modulus |
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The Young's modulus of the material of a wire is 6×1012N/m2 and  there is no transverse strain in it, then its modulus of rigidity will be

(1) 3×1012N/m2                       

(2) 2×1012N/m2

(3) 1012N/m2                             

(4) None of the above

Subtopic:  Elasticity |
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Modulus of rigidity of a liquid:

(1) Non zero constant

(2) Infinite

(3) Zero

(4) Can not be predicted

Subtopic:  Shear and bulk modulus |
 62%
From NCERT
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A cube of aluminium of sides 0.1 m is subjected to a shearing force of 100 N. The top face of the cube is displaced through 0.02 cm with respect to the bottom face. The shearing strain would be:
1. 0.02                                   
2. 0.1
3. 0.005                                
4. 0.002

Subtopic:  Stress - Strain |
 70%
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The upper end of a wire of radius 4 mm and length 100 cm is clamped and its other end is twisted through an angle of 30°. Then angle of shear is

(1) 12°                                     

(2) 0.12°

(3) 1.2°                                     

(4) 0.012°

Subtopic:  Stress - Strain |
 67%
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A rod of length l and radius r is joined to a rod of length l/2 and radius r/2 of same material. The free end of small rod is fixed to a rigid base and the free end of larger rod is given a twist of θ, the twist angle at the joint will be 

(a) θ/4                          (b) θ/2

(c) 5θ/6                         (d) 8θ/9

Subtopic:  Stress - Strain |
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Shearing stress causes a change in-

(1)   Length                              

(2)   Breadth

(3)   Shape                               

(4)   Volume

Subtopic:  Stress - Strain |
 76%
From NCERT
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To break a wire, a force of 106N/m2 is required. If the density of the material is 3×103 kg/m3, then the length of the wire which will break by its own weight will be -

(a) 34 m                             (b) 30 m

(c) 300 m                            (d) 3 m

Subtopic:  Stress - Strain |
 53%
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The strain-stress curves of three wires of different materials are shown in the figure. P, Q and R are the elastic limits of the wires. The figure shows that:
           

1. Elasticity of wire P is maximum
2. Elasticity of wire Q is maximum
3. Tensile strength of R is maximum
4. None of the above is true

Subtopic:  Stress - Strain Curve |
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